<template>
  <view>
    <!-- 搜索框 -->
    <view class="search-box">
      <uni-search-bar cancelButton="none" :radius="100" @input="input" ></uni-search-bar>
    </view>
    
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" @click="gotoDetail(item)" v-for="(item, i) in searchResults" :key="i">
        <view class="goods-name">{{ item.goods_name }}</view>
        <uni-icons type="arrow-right" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons @click="clean" type="trash" size="17"></uni-icons>
      </view>
      <view class="history-list">
        <uni-tag @click="gotoGoodsList(item)" v-for="(item, i) in histories" :key="i" :text="item"></uni-tag>
      </view>
      
    </view>
    
  </view>
</template>

<script>
  export default {
    data() {
      return {
        // 防抖操作设定的定时器
        timer: null,
        // 搜索框输入的内容
        kw: '',
        // 搜索的结果列表
        searchResults: [],
        historyList: []
      };
    },
    computed: {
      histories() {
        return [...this.historyList].reverse()
      }
    },
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
      
    },
    methods: {
      // input输入事件的处理函数
      input(e) {
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          this.kw = e
          this.getSearchList()
        }, 500)
      },
      async getSearchList() {
        // 判断搜索关键词是否为空
        if(this.kw.length === 0) {
          this.searchResults = []
          return 
        }
        
        const {data: res} = await uni.$http.get('/api/public/v1/goods/qsearch', { query: this.kw })
        if(res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        
        this.saveSearchHistory()
      },
      gotoDetail(item) {
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      // 保存搜索历史记录
      saveSearchHistory() {
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)
        uni.setStorageSync('kw', JSON.stringify(this.historyList))
      },
      clean() {
        this.historyList = []
        uni.setStorageSync('kw', '[]')
      },
      gotoGoodsList(kw) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    }
  }
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
}

.sugg-list {
  padding: 0 5px;
  .sugg-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    .goods-name {
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
  }
}
.history-box {
  padding: 0 5px;
  .history-title {
    display: flex;
    justify-content: space-between;
    height: 40px;
    align-items: center;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .history-list {
    display: flex;
    flex-wrap: wrap;
    .uni-tag {
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
